ALMA Band 1 Optics (35–50 GHz): Tolerance Analysis, Effect of Cryostat Infrared Filters and Cold Beam Measurements
ALMA Band 1 Optics (35–50 GHz): Tolerance Analysis, Effect of Cryostat Infrared Filters and Cold Beam Measurements
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ALMA 频段 1 光学器件 (35–50 GHz)：公差分析、低温恒温器红外滤光片和冷束测量的影响
DOI：
10.1007/s10762-017-0414-x
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Y.
中科院分区：
文献类型：
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作者：
A. Gonzalez;V. Tapia;R. Finger;C.;S. Asayama;Y.
阿塔卡马大型毫米/亚毫米阵列（阿尔马）是目前世界上最大的（亚）毫米波望远镜，建成后将用于35至950千兆赫所有大气窗口的天文观测。阿尔马波段1（35-50千兆赫）接收器将用于与阿尔马进行最长波长观测。由于波长较长，光学器件和波导组件的尺寸将大于其他阿尔马波段。此外，所有组件将被放置在每个天线中的阿尔马低温恒温器内，这将对接收器光学组件的尺寸和位置施加严格的机械约束。由于这些约束，波纹状馈电喇叭和透镜光学器件的设计被高度优化以符合严格的阿尔马光学要求。在本文中，我们进行了几个公差分析，以检查在这样的优化设计的制造误差的影响。其次，我们分析了在阿尔马低温恒温器内操作此光学器件的效果，特别是将低温恒温器IR滤波器放置在频带1馈电喇叭孔径附近的效果，以及随之而来的近场效应。最后，我们报告的前三个阿尔马带1接收器内测试低温恒温器，满足阿尔马规格上进行的束测量。在这些测量中，我们可以清楚地观察到制造公差和IR滤波器对原型接收机性能的影响。
The Atacama Large Millimeter/Sub-millimeter Array (ALMA) is currently the largest (sub-)mm wave telescope in the world and will be used for astronomical observations in all atmospheric windows from 35 to 950 GHz when completed. The ALMA band 1 (35–50 GHz) receiver will be used for the longest wavelength observations with ALMA. Because of the longer wavelength, the size of optics and waveguide components will be larger than for other ALMA bands. In addition, all components will be placed inside the ALMA cryostat in each antenna, which will impose severe mechanical constraints on the size and position of receiver optics components. Due to these constraints, the designs of the corrugated feed horn and lens optics are highly optimized to comply with the stringent ALMA optical requirements. In this paper, we perform several tolerance analyses to check the impact of fabrication errors in such an optimized design. Secondly, we analyze the effects of operating this optics inside the ALMA cryostat, in particular the effects of having the cryostat IR filters placed next to the band 1 feed horn aperture, with the consequent near-field effects. Finally, we report on beam measurements performed on the first three ALMA band 1 receivers inside test cryostats, which satisfy ALMA specifications. In these measurements, we can clearly observe the effects of fabrication tolerances and IR filter effects on prototype receiver performance.
WP-04：光学公差分析
DOI：
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发表时间：
2019
期刊：
影响因子：
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作者：
稲見華恵;高橋葵;大西崇介
通讯作者：
大西崇介